Portable tool



June 23, 1953 J. HYORNACK PORTABLE TOOL Filed June 26, 1947 2 Sheets-Sheet l FIG. 2

INVENTOR. JOHN HORNACK ATTORNEY June 23, 1953 J. HORNACK 2,643,083

PORTABLE TOOL Filed June 26, 1947 2 Sheets-Sheet 2 I I I FIG. 5

INVENTOR. I JOHN HORNACK (I 1 b I BY 56 W I/ la ATTORNEY Patented June 23, 1953 I PORTABLE 'rool; John Hornack, Parma, ()hio Application June 26, 1947, Serial No. 757,105

Claims. (01.2 55-45) w The invention relates, as indicated, to portable electric drills andthe like,- but has reference more particularly to novel means for augmenting. or

increasing drilling pressures. r

I A primary object of the invention is to provide, in' combination with a portable tool of the character described, means for greatly increasing pressure upon the drill in the course of the drilling operation, whereby the time of drilling is greatly reduced, and the efliciency of drilling and life of the drill greatly increased.

Another object of the invention is toprovide means of the character described, through the use of which pressures greatly in excess of those attained by manual or body'pressure are attained. I {Another object of the invention is to provide means of the character described, through the use of which the time of drilling, particularly through concrete walls, is reduced from minutes to seconds. 1 I A further object of the invention is to provide means of the character described, which can be readily associated with or incorporated into portable'electric drills of conventional types. A' further object of the invention is to provide a tool of the character described having means associated therewith for catching or receiving drillings, whereby entry of the'drillings into the tool, and falling of the drillings onto the floor or ontothe person of the driller is precluded.

A still further object of the invention is to provide a tool of the character described having meansfassociated therewith for affording avis'ual indication to the driller that the drill is'in contact with a metallic surface.

Other objects and advantages of the'invention will be" apparent during the course of the follow ingdescription.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same, Fig. l is a front elevational view of a tool embodying the principal features of my invention;

Fig. 2 is a side elevational view of the tool, as viewed from theright side of Fig. 1;

Fig. 3 is a transverse cross-sectional view, taken on theline 3-3 of Fig. 1;

Fig; 4 is a transverse cross-sectional view, taken on the line 4-4 of Fig. 1;

Fig. 5 is a fragmentary cross-sectional view, on an enlarged scale, taken on the line 5-5 of Fig. 1, and i Fig. 6 is a fragmentary view,

illustrating in a more or less diagrammatic manner, theuse of a signalling or warning device which is incor-' porated in the tool. 1

Referring more particularly to Figs. 1 to. 5 inclusive of the drawings, reference numeral l designates a portable electric drill, of a more or less conventionaltype, having a handle 2, a trigger 3 foropening and closing the circuit to the mo.- tor of the drill, a breast member 4, and a drilling tool 5, which may, as shown, be of the fluted type-having a tip 6 of cemented, carbide or similar hard material, or may besimilar to an ordinary twist drill. r a Portable electric drills of the aforesaid type areusually provided with a second handle which is similar to the handle 2, but projects from the drill casing-at a point diametrically opposite to the handle 2. Instead of such a second handle, I removably attach to the drill casing, as by means of a'threaded stud I, an hydraulic jack,

- which is generally designated by reference numeral 8. v a

The jack 8 may be of varied design, but for the purpose of this invention, I prefer to use a jack similar to that illustrated. This jack comprises a valve member'or coupling 9- having a threaded stud Ill atone end, to which a cylindrical .oil or fluid reservoir .II is secured, and

which is internally threaded at its other end, as

at I 2, for the reception of they threaded end l3 of acylinder M, which is in axial alignment with the reservoir l I. 1

Slidably" mounted ,for reciprocal movement within the cylinder I4 is a piston [5 having a ball H5 at its lower end, to which is secured a base member or pedestal H, the latter being secured to" the ball IS in such a manner as to permit limiteduniversalmovement of the member i1 rela-' tively to the piston l5; The valve member 9 has a central or axial passageway'18, provided at one end with a counterbore l9, and at the other end with a counterbore 20. The counterbore I9 is threaded at its outer end for the reception of a. ball seat member 2| having an axial passageway 22 which is in axial alignment with the passageway l8, and

which is normally closed by a spring-pressed ball 23. Similarly, the counterbore 20 is thread,- ed at its outer end for the reception of a member 24 having an axial passageway 25 which is in axial alignment with the passageway l8. The lower end of the passageway I8 is normally closed by a ball 26 through the medium of a compressioncoil spring 2'! which bears at oneend against the ball 26 and at its other end against the member 24.

The valve member 9 is also provided with an oil relief passageway 28 which is parallel with the passageway I8, and which is normally closed by means of a tapered plug 29. The plug 29 is threadedly secured within a boss 30 which extends radially from the valve member 9. The tapered plug 29 may be rotated, to open or close the passageway 28, by means of a handle 3| which extends diametrically through the plug.

At a point diametrically opposite to the boss 30, the valve member 9 is provided with a second boss 32, having a central bore 33 which communicates with the passageway I8 through a passageway 34 which extends at right angles to the passageway I8. Slidably mounted within the bore 33 for reciprocal movement therein is a piston 35. The piston 35 is adapted to be reciprocated by means of a pin 36 which extends through a recess 37 in the rear end of the piston 35.

The pin 35 is mounted in laterally-spaced ears 38 and 3Sbf'a lever '40 which is mounted for pivotal movement about a shaft or pin 4|. The pin 4| is mounted in laterally-spaced ears 42 and '43 which extend from and are formed integrally with the boss 32. A handle 44 is securedto-the lever for the purpose of effecting pivotal movement of the latter.

In order to maintain parallelism between the hydraulic jack 8 and the drill 5, a bracket 45 is provided, which is clamped to theupper end of the cylinder I4, as by means of a screw 48, which is adapted to be rotated by means of a handle or lever 41. The bracket 45 has a portion which underlies the drill casing, and is provided with an upstanding pin or stud 48 adapted to be entered in a recess or opening 49 in the drill casing. The pin or stud 48, when disposed in the recess 43,

the ball 23 is retained against its seat due to the pressure of the spring which bears thereon. The oil or fluid, entering the cylinder I4, causes the piston I5 to be extended from the cylinder. As the piston 35 is retracted, the suction created thereby causes the ball .23 to be lifted from its seat, thereby permitting a fresh supply of oil from the reservoir II to enter the passageway I8, and at this time, the ball 26 remains seated due to pressure of the spring 21. Upon again moving the piston 35 inwardly, this fresh supply of oil is, forced into the cylinder I4 in the manner already described. By repeated movements of the prevents the jack 8 from being rocked or moved about the axis of the stud I, and therefore maintains parallelism between the jack and drill 5 during use of the tool.

The tool may, if desired, be further provided a with a flexible rubber cup 50, which is clamped between and supported by a clamp member 5I. The clamp member 5I is removably mounted upon a bracket 52, which is rigidly secured to the closed upper end of the reservoir I I by means of a bolt 53,

the tip 6 of the drill adjacent to or in contact with the point at which a hole is to be drilled. The handle 44 of the jack is then actuated to transfer oil or other fluid within the reservoir I I into the cylinder I4 to thereby cause extension of the piston I5, resulting in the application of considerable pressure of the drill 5 against the surface which is being drilled. This is effected in the following manner:

As the piston 35 is moved radially inwardly, fluid within the passageway I8 is forced downwardly, thereby lifting the ball 26 from its seat, and permitting this fluid to enter the cylinder I4 through the passageway 25. At the same time,

handle 44, the piston I5 may be extended to any desired extent, thereby building up pressure against the drill to any desired degree.

When the drilling operation has been completed, the plug 29 is withdrawn from the passageway 28, and the oil in the cylinder I4 is bled back into the reservoir I I.

'Thetool, as described, is particularly useful for drilling holes through-concrete, cement, steel, etc., and in the caseof concrete ,in particular, holes may be drilled in a matter of seconds, as compared with minutes required to drill such holes without the use of the pressure-creating jack. The cup 59 isdesigned to receive the drillings and to prevent such drillings from falling into the tool bearings or onto the floor or person of the operator. It will be noted, in this connection, that thebase of the cup 50 is in spaced relation to the drill 5, so as to preclude interference of the cup with the rotation of the drill. In order to prevent particles from falling through this space, a rubber washer 54 may be mounted on the drill 5, directly above thespace between the drill and base ofuthe cup, as shown in Fig. 1. Due to the fact that the cup 50 is of rubber, it is sufficiently flexible to yield tosome extent should it strike an obstruction or uneven surface in the course of the drilling operation.

In Fig. 6, I have illustrated the operation of drilling a hole through a concrete layer C, which is disposed adjacent a steel beam, rod or conduit B. In order to prevent the drill from entering. the steel beam, after it has passed through the concrete, I have provided. the drill I with a glow lamp 55 or similar visual indication device. One end of. the filament 56 of the lamp is grounded to the drill casing or frame as at 51, and the other end to the motor field 58 of the drill, as at 59. When the tip 6 of the drill 5 touches the steel beam B, the filament of the lamp will glow, thereby indicating to the driller that the drilling operation should be stopped.

In some cases, as when the driller is standing on a ladder during the drilling operation, the tool may be provided with a curved member 50 which is rigidly attached to the lower end of the piston I5. The member -60, in this case is disposed over a rung R of the ladder, which then acts as the reactionary member, instead of the surface S. In cases where the tool is used in a horizontal position, a chainmay be attached to the member 60, the chain then acting as the reactionary member.

It is to be understoodv that the form of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes in theshape, size and arrangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the subjoined claims. I

I Having thus described my invention, I claim:

' member and in axial alignment with thereservoir, a piston in said cylinder, and means for transferring fluid from said reservoir to said cylinder to cause an extension of said piston from said cylinder, said transferring means comprising a second piston adapted to force liquid in said passageway into said cylinder, and means for reciprocating said second piston, said reciprocating means comprising a lever pivotally mounted on said valve member and pivotally connected to said second piston and a handle secured to said lever for oscillating said lever.

2. The combination, as defined in claim -1, in which said second piston has a recess extending diametrically of the piston, and said lever has a pin mounted thereon which extends through said recess.

3. The combination, as defined in claim 1, in which a fluid relief passageway is provided in said valve member which is parallel with said first-named passageway, and a plug is provided for normally closing said fluid relief passageway.

4. The combination, as defined in claim 1, in which means are provided for maintaining parallelism between said reservoir and the drilling tool, said means comprising a bracket secured to said cylinder, said bracket having a portion which underlies the drill casing and is provided with an upstanding pin adapted to enter a recess in the drill casing.

5. In combination, a portable electric drill having a rotatable drilling tool, and means associated with said drill for exerting pressure on the drill in the direction of the axis of the drilling tool during the drilling operation, said means comprising a valve member having a passageway extending therethrough, said passagewaynormally closed at both ends by means of oppositely acting check valves, a fluid reservoir secured to said valve member, a cylinder secured to said valve member and to the drill, a piston in said cylinder, and means for transferring fluid from said reservoir to said cylinder to cause-an extension of said piston from said cylinder whereby to exert pressure on said drill, the length of said cylinder being considerably greater than the length of the drill casing.

JOHN HORNACK.

References Cited in the flle of this patent UNITED STATES PATENTS Number Name Date 568,471 Ball Sept. 29, 1896 288,712 Eddy May 2, 1905 1,003,075 Wahlstrom Sept. 12, 1911 1,023,921 Brown Apr. 25, 1912 1,750,415 Marsh Mar. 11, 1930 1,930,099 Kelley Oct. 10, 1933 2,131,291 Maust Sept. 2'7, 1938 2,136,675 Danse Nov. 15, 1938 2,196,208 Gardner, Jr. Apr. 9, 1940 2,283,593 Akins May 19, 1942 2,296,817 Gartin Sept. 22, 1942 2,405,110 Bullock Aug. 6, 1946 FOREIGN PATENTS Number Country Date Germany Apr. 6, 1880 

